How do you type multiple lines of code into IDLE? My Python environment does not look like the one projected in the lectures. I am on a Mac platform running python build 2.7.3

As long as you loaded Idle and not the command interpreter, you will be in the 'Shell', just go to 'File', 'New Window' and that will open the 'Editor' where you can write lines and save them to a file.

You can type multiple lines of code using the OSX IDLE, just type it directly line by line and it knows that its multi-line. You exit by sending a blank line, also if you scroll up and press enter on multi-line code it will retype out for you automatically, allowing you to quickly edit it.

@inicloud if u r doing the 6.00x course (of EdX) then u should probable download and install the python version given on the site.might work better for u:).
http://www.enthought.com/products/epd_free.php
this is the link to it. follow the instruction given in problem set 1.